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COSHH & WORKPLACE EXPOSURE LIMITS

From 6 April 2005, a new focus on good practice will help employers meet their duties under the Control of Substances Hazardous to Health Regulations (COSHH).

The existing requirements to follow good practice are being clarified and brought together by the introduction of eight principles, which will apply regardless of whether a substance has an Occupational Exposure Limit:

• Design and operate processes and activities to minimise emission, release and spread of substances hazardous to health.
• Take into account all relevant routes of exposure - inhalation, skin absorption and ingestion - when developing control measures.
• Control exposure by measures that are proportionate to the health risk.
• Choose the most effective and reliable control options which minimise the escape and spread of substances hazardous to health.
• Where adequate control of exposure cannot be achieved by other means, provide, in combination with other control measures, suitable personal protective equipment.
• Check and review regularly all elements of control measures for their continuing effectiveness.
• Inform and train all employees on the hazards and risks from the substances with which they work and the use of control measures developed to minimise the risks.
• Ensure that the introduction of control measures does not increase the overall risk to health and safety.

  A single type of limit is also being introduced, with Workplace Exposure Limits (WELs) replacing Maximum Exposure Limits (MELs) and Occupational Exposure Standards (OESs). The OESs for around 100 substances will be deleted as the substances are now banned, scarcely used or there is evidence to suggest adverse health effects close to the old limit value.

  Two new limits are being introduced for Refractory Ceramic Fibres and Subtilisins.

  As the numerical values of the other limits being transferred to the new system are unchanged, suppliers may exhaust stocks of safety data sheets that refer to MELs and OESs before producing new ones that refer to WELs. Similarly, COSHH assessments can be updated as part of duty holders periodic reviews.

  As of 6 April, adequate control of exposure will require employers to:

• apply the eight principles of good practice for the control of substances hazardous to health;
• ensure that the WEL is not exceeded; and
• ensure that exposure to substances that can cause occupational asthma; cancer; or damage to genes that can be passed from one generation to another; is reduced as low as is reasonably practicable.

  Workplace Exposure Limits

  The following tables, supplementary information and calculation methods have been extracted from EH40/2005 which contains the list of workplace exposure limits for use with the Control of Substances Hazardous to Health Regulations 2004 (as amended).

  UPDATED JULY 2007

• Table 1: List of approved workplace exposure limits
• Table 1: Supplementary information
• Table 2: Biological Monitoring Guidance Values
• Calculation methods

  

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